Clematis terniflora (sweet autumn clematis, sweet autumn virginsbower, 圆锥铁线莲 yuan zhui tie xian lian) is a plant in the buttercup family, Ranunculaceae. It is native to countries in northeastern Asia (China, Japan, Korea, Mongolia, Russia (Siberia), Taiwan).. It was introduced into the United States in the late 1800s as an ornamental garden plant, and has naturalized in many of the eastern states. It is considered a Category II invasive plant in New Jersey, Sout